Article ID: 18

I've been trying to get TeXmacs with its Maxima plugin to work.

Enabling the "mathematical input" mode in its interactive sessions I can use TeXmacs as a nice computer algebra system. However, an issue arises when I use integration.

If I enter \(\displaystyle\int x\,\mathrm{d}\,x\) with "`\int <enter>x d<tab><tab>x`

" (spaces here are actually typed in while the "`<tab>`

"s and "`<enter>`

"s are their respective keys), I get this idiosyncratic error:

incorrect syntax: 1 is not an infix operator integrate( x 1, ^

This seems to be a bug when TeXmacs is translating things into Maxima. Just replace the "`<tab>`

" between the integrand and the "\(\mathrm{d}\)" with a multiplication operator entered by "`*`

". For example, `\int <enter>x*d<tab><tab>x`

yields the correct result of \(\displaystyle\frac{x^2}{2}\) rather than the nonsensical error.

For reference, the source code of a demonstration document is included below in Scheme and XML-like (?) formats.

(document (TeXmacs "2.1.1") (style (tuple "generic" "maxima")) (body (document (session "maxima" "default" (document (unfolded-io-math (document (with "color" "red" (concat "(" (with "math-font-family" "rm" "%i") "8) "))) (document (concat (big "int") " xx")) (document "" "incorrect syntax: 1 is not an infix operator" "integrate( x 1," " ^")) (unfolded-io-math (document (with "color" "red" (concat "(" (with "math-font-family" "rm" "%i") "8) "))) (document (concat (big "int") "x* x")) (document "" (concat " " (math (with "math-display" "true" (concat (text (with "font-family" "tt" "color" "red" (concat "(" (with "math-font-family" "rm" "%o8") ") "))) (frac (concat "x" (rsup "2")) "2"))))))))))) (initial (collection (associate "page-medium" "paper") (associate "preamble" "true") (associate "prog-scripts" "maxima"))))

<TeXmacs|2.1.1> <style|<tuple|generic|maxima>> <\body> <\session|maxima|default> <\unfolded-io-math> <with|color|red|(<with|math-font-family|rm|%i>8) > <|unfolded-io-math> <big|int> x \<mathd\> x <|unfolded-io-math> \; incorrect syntax: 1 is not an infix operator integrate( x 1, \ \ \ \ \ \ \ \ \ \ \ \ \ ^ </unfolded-io-math> <\unfolded-io-math> <with|color|red|(<with|math-font-family|rm|%i>8) > <|unfolded-io-math> <big|int>x*\<mathd\> x <|unfolded-io-math> \; \ <math|<with|math-display|true|<text|<with|font-family|tt|color|red|(<with|math-font-family|rm|%o8>) >><frac|x<rsup|2>|2>>> </unfolded-io-math> </session> </body> <\initial> <\collection> <associate|page-medium|paper> <associate|preamble|false> <associate|prog-scripts|maxima> </collection> </initial>